大型深基坑逆作開挖變形性狀研究
[Abstract]:How to reduce the impact on road traffic, protect the safety of adjacent buildings, at the same time guarantee the construction period and reduce the cost of constructing large underground stations in the areas with heavy traffic and adjacent high-rise buildings, The construction method combining open excavation with cover excavation and reverse construction can solve the above problems well. Firstly, this paper introduces the development of foundation pit engineering, the advantages and disadvantages and application scope of the reverse method, the deformation mechanism of deep foundation pit and the research status at home and abroad, and summarizes the influencing factors of foundation pit deformation. Secondly, taking the Futian station of Guangzhou-Shenzhen passenger dedicated line as the engineering background, this paper briefly introduces the general situation of the project, including the basic conditions of the station, engineering geology, hydrogeology and climate characteristics, foundation pit segmentation and enclosure scheme. Foundation pit dewatering and excavation. In view of the complex structure, large scale, tight construction period, complex geological conditions and high safety risk of the Futian Station, the countermeasures of the heavy and difficult problems in the construction process are put forward. Then, taking the deformation behavior of foundation pit as the research object, using the MIDAS/GTS finite element software to establish the three-dimensional model of the inverse excavation section, the horizontal displacement of the underground continuous wall in the course of excavation is analyzed. By changing the parameters of enclosure structure and overloading, the thickness of underground continuous wall, the depth of embedded wall, the elastic modulus of wall are analyzed, which are related to the uplift of the bottom soil and the settlement of the surface soil in the pit, and by changing the parameters of the enclosure structure and the size of the overload, the thickness of the underground continuous wall is analyzed. In order to optimize the design of retaining structure of foundation pit, the influence of five factors, namely ground overload and pile diameter of vertical column, on the deformation of foundation pit is discussed in this paper. Finally, Futian station in the foundation pit construction process, by a third party to carry out a comprehensive, systematic monitoring, the establishment of a five-level early warning system. The finite element numerical simulation results are compared with the measured data, and the difference between the foundation pit deformation and the engineering practice is summarized and the reasons are analyzed. The research in this paper has certain practical value and can provide reference for similar engineering construction and research work in the future.
【學位授予單位】:華南理工大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU753
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